/*
 * jQuery UI Droppable 1.6
 *
 * Copyright (c) 2008 AUTHORS.txt (http://ui.jquery.com/about)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * http://docs.jquery.com/UI/Droppables
 *
 * Depends:
 *	ui.core.js
 *	ui.draggable.js
 */
(function($) {

    $.widget("ui.droppable", {
        _init: function() {

            var o = this.options, accept = o.accept;
            this.isover = 0;
            this.isout = 1;

            this.options.accept = this.options.accept && $.isFunction(this.options.accept) ? this.options.accept : function(d) {
                return d.is(accept);
            };

            //Store the droppable's proportions
            this.proportions = {width: this.element[0].offsetWidth, height: this.element[0].offsetHeight};

            // Add the reference and positions to the manager
            $.ui.ddmanager.droppables[this.options.scope] = $.ui.ddmanager.droppables[this.options.scope] || [];
            $.ui.ddmanager.droppables[this.options.scope].push(this);

            (this.options.cssNamespace && this.element.addClass(this.options.cssNamespace + "-droppable"));

        },
        destroy: function() {
            var drop = $.ui.ddmanager.droppables[this.options.scope];
            for (var i = 0; i < drop.length; i++)
                if (drop[i] == this)
                    drop.splice(i, 1);

            this.element
                    .removeClass("ui-droppable-disabled")
                    .removeData("droppable")
                    .unbind(".droppable");
        },
        _setData: function(key, value) {

            if (key == 'accept') {
                this.options.accept = value && $.isFunction(value) ? value : function(d) {
                    return d.is(accept);
                };
            } else {
                $.widget.prototype._setData.apply(this, arguments);
            }

        },
        _activate: function(event) {

            var draggable = $.ui.ddmanager.current;
            $.ui.plugin.call(this, 'activate', [event, this.ui(draggable)]);
            if (draggable)
                this.element.triggerHandler("dropactivate", [event, this.ui(draggable)], this.options.activate);

        },
        _deactivate: function(event) {

            var draggable = $.ui.ddmanager.current;
            $.ui.plugin.call(this, 'deactivate', [event, this.ui(draggable)]);
            if (draggable)
                this.element.triggerHandler("dropdeactivate", [event, this.ui(draggable)], this.options.deactivate);

        },
        _over: function(event) {

            var draggable = $.ui.ddmanager.current;
            if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0])
                return; // Bail if draggable and droppable are same element

            if (this.options.accept.call(this.element, (draggable.currentItem || draggable.element))) {
                $.ui.plugin.call(this, 'over', [event, this.ui(draggable)]);
                this.element.triggerHandler("dropover", [event, this.ui(draggable)], this.options.over);
            }

        },
        _out: function(event) {

            var draggable = $.ui.ddmanager.current;
            if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0])
                return; // Bail if draggable and droppable are same element

            if (this.options.accept.call(this.element, (draggable.currentItem || draggable.element))) {
                $.ui.plugin.call(this, 'out', [event, this.ui(draggable)]);
                this.element.triggerHandler("dropout", [event, this.ui(draggable)], this.options.out);
            }

        },
        _drop: function(event, custom) {

            var draggable = custom || $.ui.ddmanager.current;
            if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0])
                return false; // Bail if draggable and droppable are same element

            var childrenIntersection = false;
            this.element.find(":data(droppable)").not(".ui-draggable-dragging").each(function() {
                var inst = $.data(this, 'droppable');
                if (inst.options.greedy && $.ui.intersect(draggable, $.extend(inst, {offset: inst.element.offset()}), inst.options.tolerance)) {
                    childrenIntersection = true;
                    return false;
                }
            });
            if (childrenIntersection)
                return false;

            if (this.options.accept.call(this.element, (draggable.currentItem || draggable.element))) {
                $.ui.plugin.call(this, 'drop', [event, this.ui(draggable)]);
                this.element.triggerHandler("drop", [event, this.ui(draggable)], this.options.drop);
                return this.element;
            }

            return false;

        },
        plugins: {},
        ui: function(c) {
            return {
                draggable: (c.currentItem || c.element),
                helper: c.helper,
                position: c.position,
                absolutePosition: c.positionAbs,
                options: this.options,
                element: this.element
            };
        }

    });

    $.extend($.ui.droppable, {
        version: "1.6",
        defaults: {
            accept: '*',
            activeClass: null,
            cssNamespace: 'ui',
            greedy: false,
            hoverClass: null,
            scope: 'default',
            tolerance: 'intersect'
        }
    });

    $.ui.intersect = function(draggable, droppable, toleranceMode) {

        if (!droppable.offset)
            return false;

        var x1 = (draggable.positionAbs || draggable.position.absolute).left, x2 = x1 + draggable.helperProportions.width,
                y1 = (draggable.positionAbs || draggable.position.absolute).top, y2 = y1 + draggable.helperProportions.height;
        var l = droppable.offset.left, r = l + droppable.proportions.width,
                t = droppable.offset.top, b = t + droppable.proportions.height;

        switch (toleranceMode) {
            case 'fit':
                return (l < x1 && x2 < r
                        && t < y1 && y2 < b);
                break;
            case 'intersect':
                return (l < x1 + (draggable.helperProportions.width / 2) // Right Half
                        && x2 - (draggable.helperProportions.width / 2) < r // Left Half
                        && t < y1 + (draggable.helperProportions.height / 2) // Bottom Half
                        && y2 - (draggable.helperProportions.height / 2) < b); // Top Half
                break;
            case 'pointer':
                var draggableLeft = ((draggable.positionAbs || draggable.position.absolute).left + (draggable.clickOffset || draggable.offset.click).left),
                        draggableTop = ((draggable.positionAbs || draggable.position.absolute).top + (draggable.clickOffset || draggable.offset.click).top),
                        isOver = $.ui.isOver(draggableTop, draggableLeft, t, l, droppable.proportions.height, droppable.proportions.width);
                return isOver;
                break;
            case 'touch':
                return (
                        (y1 >= t && y1 <= b) || // Top edge touching
                        (y2 >= t && y2 <= b) || // Bottom edge touching
                        (y1 < t && y2 > b)		// Surrounded vertically
                        ) && (
                        (x1 >= l && x1 <= r) || // Left edge touching
                        (x2 >= l && x2 <= r) || // Right edge touching
                        (x1 < l && x2 > r)		// Surrounded horizontally
                        );
                break;
            default:
                return false;
                break;
        }

    };

    /*
     This manager tracks offsets of draggables and droppables
     */
    $.ui.ddmanager = {
        current: null,
        droppables: {'default': []},
        prepareOffsets: function(t, event) {

            var m = $.ui.ddmanager.droppables[t.options.scope];
            var type = event ? event.type : null; // workaround for #2317
            var list = (t.currentItem || t.element).find(":data(droppable)").andSelf();

            droppablesLoop: for (var i = 0; i < m.length; i++) {

                if (m[i].options.disabled || (t && !m[i].options.accept.call(m[i].element, (t.currentItem || t.element))))
                    continue;	//No disabled and non-accepted
                for (var j = 0; j < list.length; j++) {
                    if (list[j] == m[i].element[0]) {
                        m[i].proportions.height = 0;
                        continue droppablesLoop;
                    }
                }
                ; //Filter out elements in the current dragged item
                m[i].visible = m[i].element.css("display") != "none";
                if (!m[i].visible)
                    continue; 									//If the element is not visible, continue

                m[i].offset = m[i].element.offset();
                m[i].proportions = {width: m[i].element[0].offsetWidth, height: m[i].element[0].offsetHeight};

                if (type == "dragstart" || type == "sortactivate")
                    m[i]._activate.call(m[i], event); 										//Activate the droppable if used directly from draggables

            }

        },
        drop: function(draggable, event) {

            var dropped = false;
            $.each($.ui.ddmanager.droppables[draggable.options.scope], function() {

                if (!this.options)
                    return;
                if (!this.options.disabled && this.visible && $.ui.intersect(draggable, this, this.options.tolerance))
                    dropped = this._drop.call(this, event);

                if (!this.options.disabled && this.visible && this.options.accept.call(this.element, (draggable.currentItem || draggable.element))) {
                    this.isout = 1;
                    this.isover = 0;
                    this._deactivate.call(this, event);
                }

            });
            return dropped;

        },
        drag: function(draggable, event) {

            //If you have a highly dynamic page, you might try this option. It renders positions every time you move the mouse.
            if (draggable.options.refreshPositions)
                $.ui.ddmanager.prepareOffsets(draggable, event);

            //Run through all droppables and check their positions based on specific tolerance options

            $.each($.ui.ddmanager.droppables[draggable.options.scope], function() {

                if (this.options.disabled || this.greedyChild || !this.visible)
                    return;
                var intersects = $.ui.intersect(draggable, this, this.options.tolerance);

                var c = !intersects && this.isover == 1 ? 'isout' : (intersects && this.isover == 0 ? 'isover' : null);
                if (!c)
                    return;

                var parentInstance;
                if (this.options.greedy) {
                    var parent = this.element.parents(':data(droppable):eq(0)');
                    if (parent.length) {
                        parentInstance = $.data(parent[0], 'droppable');
                        parentInstance.greedyChild = (c == 'isover' ? 1 : 0);
                    }
                }

                // we just moved into a greedy child
                if (parentInstance && c == 'isover') {
                    parentInstance['isover'] = 0;
                    parentInstance['isout'] = 1;
                    parentInstance._out.call(parentInstance, event);
                }

                this[c] = 1;
                this[c == 'isout' ? 'isover' : 'isout'] = 0;
                this[c == "isover" ? "_over" : "_out"].call(this, event);

                // we just moved out of a greedy child
                if (parentInstance && c == 'isout') {
                    parentInstance['isout'] = 0;
                    parentInstance['isover'] = 1;
                    parentInstance._over.call(parentInstance, event);
                }
            });

        }
    };

    /*
     * Droppable Extensions
     */

    $.ui.plugin.add("droppable", "activeClass", {
        activate: function(event, ui) {
            $(this).addClass(ui.options.activeClass);
        },
        deactivate: function(event, ui) {
            $(this).removeClass(ui.options.activeClass);
        },
        drop: function(event, ui) {
            $(this).removeClass(ui.options.activeClass);
        }
    });

    $.ui.plugin.add("droppable", "hoverClass", {
        over: function(event, ui) {
            $(this).addClass(ui.options.hoverClass);
        },
        out: function(event, ui) {
            $(this).removeClass(ui.options.hoverClass);
        },
        drop: function(event, ui) {
            $(this).removeClass(ui.options.hoverClass);
        }
    });

})(jQuery);
